Cita APA (7th ed.)

Wulf, L. d., & .Sokol, J. B. (2004). Customs modernization initiatives: Case studies. World Bank.

Cita Chicago (17th ed.)

Wulf, Luc de, i Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. Washington, DC: World Bank, 2004.

Cita MLA (9th ed.)

Wulf, Luc de, i Jose B. .Sokol. Customs Modernization Initiatives: Case Studies. World Bank, 2004.

Atenció: Aquestes cites poden no estar 100% correctes.